17 Cl 9 F Based on the number of occupied principal shells (i.e., closeness of valence electrons from the nucleus), fluorine has a higher electron affinity than chlorine. Hence, F will capture electrons from Cl, not the other way around. Hence, F is the best oxidizing agent, followed by Cl, then Br, then I. (a) Cl 2 (g) + Br-(aq) → Since Cl is a better oxidizing agent than Br, it will take electrons from Br. Therefore, Cl 2 (g) + 2Br-(aq) → 2Cl-+ Br 2 Note: the oxidation state of Cl 2 is reduced from 0 to -1, so it is reduced, and is the oxidizing agent. (b) I 2 (s) + F-(aq) → No reaction. There would have been a reaction if the equation was: F 2 (s) + I-(aq) → (c) Br 2 (l) + I-(aq) → Since Br is a better oxidizing agent than I, it will take electrons from I. Therefore, Br 2 (g) + 2I-(aq) → 2Br-+ I 2 Note: the oxidation state of Br 2 is reduced from 0 to -1, so it is reduced, and is the oxidizing agent. 78. Arrange the following ionization energies in the most probable order of increasing value, and explain your reasoning: I 1 for B, I 1 for Cs, I 2 for In, I 2 for Sr, I 2 for Xe, and I 3 for Ca. 5

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